101555243666 has 16 divisors (see below), whose sum is σ = 157602634200. Its totient is φ = 49021408128.

The previous prime is 101555243659. The next prime is 101555243731. The reversal of 101555243666 is 666342555101.

It can be written as a sum of positive squares in 4 ways, for example, as 64323611641 + 37231632025 = 253621^2 + 192955^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481280 + ... + 659348.

Almost surely, 2^101555243666 is an apocalyptic number.

101555243666 is a deficient number, since it is larger than the sum of its proper divisors (56047390534).

101555243666 is a wasteful number, since it uses less digits than its factorization.

101555243666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187933.

The product of its (nonzero) digits is 648000, while the sum is 44.

Adding to 101555243666 its reverse (666342555101), we get a palindrome (767897798767).

The spelling of 101555243666 in words is "one hundred one billion, five hundred fifty-five million, two hundred forty-three thousand, six hundred sixty-six".